Thytronic NG10 - Protective Functions: Ground Fault, Differential, and Breaker Failure

TECHNICAL DATA
18
NG10 - Manual - 04 - 2022
 Low impedance restricted ground fault - 64REF side H
64REF) Minimum threshold (I
REF
>) 0.05...2.00 I
En
(step 0.01 I
En
)
64REF Intentional delay (t
REF
>) 0.03...60.00 s (step 0.01 s)
Pickup time ≤ 0.04 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.05 s
Overshoot time 0.04 s
Pickup accuracy ± 4% with 0.1 I
n,
± 1% with 1 I
n
Operate time accuracy 5% or ± 10 ms
 Differential - 87G-M-L
CT saturation detector
87G-M-L Saturation detector enable (S
at-Det
) ON/OFF
87T Saturation detector intentional reset time delay (t
Sat-Det-RES
) 0.00...0.50 s (step 0.01 s)
I
d
> Element
87G-M-L First threshold (
I
d
>) 0.05...2.00 I
nref
(step 0.01 I
nref
)
87G-M-L First stretch slope percentage (
K1 ) 10...50% (step 1 %)
87G-M-L Second branch slope percentage (
K2 ) 25...100% (step 1 %)
87G-M-L Second branch intersection with vertical axis (
Q ) 0.00...3.00 I
nref
(step 0.01 I
nref
)
87G-M-L First threshold operating time
I
d
> (t
d
>) 0.04 s
I
d
>> Element
87G-M-L Second threshold (
I
d
>>) 0.50...30.00 I
nref
(step 1.00 I
nref
)
87G-M-L Second threshold operating time
I
d
>> (t
d
>>) 0.03 s
 Breaker failure - BF
BF Phase current threshold (I
BF
>) 0.05...1.00 I
n
(step 0.01 I
n
)
BF Operating time (t
BF
) 0.06...10.00 s (step 0.01 s)
Dropout ratio 0.95...0.98
Dropout time ≤ 0.05 s
I
BF
>Pickup accuracy ± 0.5% with 0.1 I
n
± 0.2% with 1 I
n
I
EBF
>Pickup accuracy ± 0.5% with 0.01 I
En
± 0.2% with 1 I
En
Operate time accuracy 5% or ± 10 ms